Improved batceet-brage



Quinn tatrs afrnt ffice.

WILL-IAM F. CORNELL, OF ADRIAN, MICHIGAN, ASSIGNOR TO HIMSELF AND 'SILAS HURLBUT, OF SAME PLAGE.

Letters Patent No. 81,145, dated August 18, 1868.

IMPROVED RATGHET-BRAGB.

TO ALL WHOM IT AMAY CONCERN:

Be it known that I, WILLIAM F. CORNELL, of the city of Adrian, in the county of Lenawee, and Stat-e of Michigan, have invented a new and useful Improvement in Ratchet-Braces; and I do hereby declare the following to be a full, clear, and exact description of the saine, which will enable othersskilled in the art to m'akc and use my invention, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification, like letters referring to like parts.

My invention consists in a ratchet-brace for drilling, countersinking, and counterboring, to be used by machinists, boiler-makers, and others, so constructed that bythe use of one scrow-ring cap and pinch-screw either the ratchet-drill shaft or ratchet-countersink shaft canbe placed in the ratchet-brace.

T o enable others skilled in the art to make and use my invention, I will proceed to describe its construction' and operation. v

Figure 1 represents a perspective view of a ratchet-brace embodying my invention.

Figure 2 represents a view of the centre being divided perpendicularly, by which all parts of the ratchetbrace for drilling can be seen.

Figure 3 represents a view of the centre 'being divided horizontally, showing theratchet-shaft and teeth, also the pawl and teeth and spiral spring.

Figure 4 represents a cylindrical socket'A, with its thread s and arm B, with pawl D in `the horizontal cylindrical socket P of arm B.

Figure 5 represents a round pawl, D, with its teeth e and groove z.

Figure 6 represents a screw-ring cap E, with the thread don the ring.

Figure 7 represents a spiral spring;

Figure 8 represents a ratchet-shaft with countersink M attached, and spindle L in the centre, also thumbnuts 'n and o. l

Figure Q represents a spindle, L, with thread T on large end, and thread Y on spindle L.

Figure 10 represents a counterbore, K, with its shank V and feather c, so as to fit inthe cylindrical socket X in the bottom end of ratchet-shaft G. i

Having thus described the construction of my improved ratchet-brace, I will now describe its operation and use.

First. In order toouse my improved ratchet-brace to drill, eounterbore, or countersink, I put the shank of the drill, connterbore, or countcrsink, in the slightly-tapered square hole m, in the bottom end of ratchet-shaft C, in a direction parallel to its axis. Then place the conical point of feed-screw I against a frame or knee, and the cutting-end of' said tool ou the work, and move the handle H to one side, (to the right side,) and the teeth e, on pawl D, catch the teeth e of ratchet-shaft C, and the ratchet C is rotated in that direction. Then I push the handle H to the other side, (to the left,) and the inclined plane on the back of the teeth e and c is allowed to pass by means of the spiral spring G. The spiral spring G brings the pawl D to its work again, when the operation is repeated, one end of said spring Gr setting against the shoulder 6 in the hollow end of handle I-I, and the other against the end of pawl D. The tools are kept to their work by means ofthe feed-screw I.

Second. In order to use said ratchet-brace to counterbcre or countersink over tapped holes, I set the pinch-screw F against pawl D, which keeps pawl D in its socket P, to save the annoyance of pawl D coming out while changing the ratchet-shafts C and C. I next unscrew the screw-ring cap E, and take ratchet-shaft C from the cylindrical socket A, and put ratchet-shaft C in said socket A, screw on Screw-ring cap E, unloose pinch-screw F, which allows all parts to work. I then screw thumb-nut n to the top of spindle L, also thumbnut o up and jamh against thumb-nut So, by turning both thc nuts, 7L and o, I can `screw the large end, T, of spindle L into n. tapped hole to be countersunk or counterbored. I then unloose thumbmut o, and screw down to top of ratchet-shaft C; this brings the cutters of countersink Mor eounterbore K to their work, and are fed by thumb-nut o. The ratchet-shaft C4 revolves on spindle L. "lhc counterbore and conntcrsink-tool can be made in any desired shape. The shank V of connterbore K and countersink M is made to t in the cylindrical socket X in the lower end ofratchet-shaft C, and is united by feather c on the shank V and shoulder of counterbore K,'which ts in seat i of ratchet-shaft C. The ratchet-shaft C may be made with the countersink M and counterbore K solid, or a ratchet-shaft' for each brace, in which casethe pinch-screw F would be of no use. The objectof the round pawl D operatingl in the horizontal cylindrical socket P, is, that the circle in the socket P and on pawl D can allow pawl D to rotate so that the faces of the teeth e and e can have an equal pressure, top and bottom.

Claims.

Having thus described 'my invention, its operation and `use, what I claim as new, and desire to secure by Letters Patent, 'is- 1. The combination of the socket'ed arm B, ratchet-wheel J, and shaft C, and feed-screw I, substantially as and for the purpose set forth.

2. The combination of the screwring cap-E with the cylindrical socket A, and ratchet-shaft C, substantially as and for the purpose set forth.

8. The combination of 'the counterhore K 0r counter-sink M with ratchetshaft C, wheel J, the cylindrical socket X, shank V, feather e, and seat z, for the purpose as setforth and described.

4. Thecombination of thethumb-nuts n and o with yspindle L, constructed in the manner and for the purpose as set forth and described. A WM. F. CORNELL.

Witnesses:

LIzzIE REDFIELD, A. W. BENEDICT. 

